[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryotes see Domain Eukaryota Chatton, 1925
     Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
       Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
         Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
           Phylum Chordata Bateson, 1885 - chordates
             Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
               Infraphylum Gnathostomata Gegenbaur, 1874 - jawed vertebrates see Superclass Gnathostomata Gegenbaur, 1874
                 Class Osteichthyes Huxley, 1880 - bony fishes and tetrapods see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
                   Subclass Sarcopterygii Romer, 1955 - lobe-finned fishes and tetrapods see [unranked] Sarcopterygii Romer, 1955
                     Infraclass Crossopterygii Huxley, 1861
                       Infraclass Tetrapodomorpha Ahlberg, 1991 see [unranked] Tetrapodomorpha Ahlberg, 1991
                         Superorder Osteolepidida Boulenger, 1901 see [unranked] Osteolepidimorpha
                           Superclass Tetrapoda Goodrich, 1930 - tetrapods see Clade Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988], nom. cl. inval.
                             Class Unnamed
                               Superorder Reptiliomorpha Säve-Söderbergh, 1934 see [unranked] Reptiliomorpha Säve-Söderbergh, 1934
                                 Batrachosauria
                                   Series Amniota Haeckel, 1866 see Clade Amniota Haeckel 1866 [Laurin & Reisz 2020]
                                     Class Sauropsida Huxley, 1864 see Clade Reptilia Linnaeus 1758 [Gauthier 1984], nom. cl. inval.
                                       Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
                                         Neodiapsida Benton 1985
                                           Infraclass Archosauromorpha Huene, 1946 see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
                                             Division Archosauria Cope, 1869 see Clade Archosauria Cope 1869 [Gauthier & Padian 1985], nom. cl. inval.
                                               Avesuchia Benton, 1999 see Clade Archosauria Cope 1869 [Gauthier & Padian 1985], nom. cl. inval.
                                                 Subdivision Avemetatarsalia Benton, 1999 see Clade Avemetatarsalia Benton 1999
                                                   Infradivision Ornithodira Gauthier, 1986 see Clade Ornithodira Gauthier 1986
                                                     Dinosauromorpha Benton 1985 [Sereno 1991], nom. cl. inval. see Clade Dinosauromorpha Benton 1985 [M. Ezcurra, S. Nesbitt, M. Bronzati, F. Dalla Vecchia, F. Agnolin, R. Benson, ..., M. Langer 2020]
                                                       Dinosauriformes Novas 1992, nom. cl. inval. see Clade Dinosauriformes Novas 1992 [M. Ezcurra, S. Nesbitt, M. Bronzati, F. Dalla Vecchia, F. Agnolin, R. Benson, ..., M. Langer 2020]
                                                         Superorder Dinosauria Owen, 1841 - dinosaurs see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020]
                                                           Order †Ornithischia Seeley, 1887
                                                             †Genasauria Sereno 1986
                                                               Suborder †Cerapoda Sereno, 1986
                                                                 †Marginocephalia Sereno 1986
                                                                   Infraorder †Ceratopsia Marsh, 1890
                                                                     1 Family †Psittacosauridae Osborn, 1923
                                                                     2 Family †Protoceratopsidae Granger & Gregory, 1923
                                                                     3 Family †Ceratopsidae Marsh, 1888